Reporting in Nature Geoscience, two coastal scientists write that rising sea levels, combined with slow Mississippi Delta growth, could drown the Louisiana coast by 2100. Delta expert Ivor van Heerden, who is not involved with the research, discusses the findings.

New guidelines from the U.S. Preventive Services Task Force recommend women start getting routine mammograms at age 50, not 40. Ira Flatow and guests take a closer look at the guidelines and what they mean for women's health.

Wildlife experts are trying to determine what's causing hibernating bats in the Northeast to die en masse. The condition has been dubbed "white-nose syndrome," after a white fungus seen on bats' noses. Researchers are racing to explain the deaths â€” and keep the disease from spreading.